Final answer:
Irregularities in the object being measured and other factors that affect the outcome can create problems for estimating reliability in criterion-referenced tests.
Step-by-step explanation:
One possible feature of criterion-referenced tests that might create problems for estimating reliability is the presence of irregularities in the object being measured. If the object being measured is not consistent or stable, it can lead to inconsistent test scores and lower reliability. For example, if a test is measuring reading comprehension skills and the passages used in the test vary widely in difficulty, it can affect the reliability of the scores.
Another factor that can affect reliability is the presence of other factors that influence the outcome. These factors can be highly dependent on the situation. For example, if a criterion-referenced test is measuring problem-solving skills and the test environment or instructions provided to the students vary from one administration to another, it can introduce inconsistencies and impact the reliability of the test.